Fast new ASASSN-16kt has beryllium

Fast new ASASSN-16kt has beryllium

Scientists from the Institute of Astrophysics of Andalusia (Spain) conducted a high-resolution spectroscopic review of the fast, new ASASSN-16kt.

ASASSN-16kt is a fast oxygen-neon new, remote at 33,000 light years. In September 2016, it was found by ASAS-SN (supernova search system), and two days later its maximum value reached 6.3, after which it began to rapidly decay.

For observations, scientists used the UVES and X-Shooter spectrographs on the Very Large Telescope (Chile), as well as the PUCHEROS optical spectrograph on the 0.5-m telescope of the Pontiff Observatory of the University of Catalonia. Observations made it possible to find the presence of beryllium (Be) in a new one.

The researchers confirm that a thorough analysis of the spectra in the early stages showed the presence of low-ionization lines, as well as the ionized doublet 7Be in an area relatively protected from possible contaminants.

Fast new ASASSN-16kt has beryllium

Spectrum ASASSN-16kt on the 8th day. The figure shows the spectra around Be ii λ3130 (black), Na i λ5890 (green), Fe ii λ5169 (blue) and Ca ii λ3933 (red) plotted on the speed scale Calculations show that ASASSN-16kt has created 5.9-7.7 billion solar masses 7Be. Also recorded bright neon (Ne) lines, which may indicate a massive predecessor (1.2 solar masses). Most likely, we are talking about an oxygen-neon white dwarf.

In the period of advanced phases of red giants, the reaction of two helium isotopes (He) - 3He with 4He can lead to the 7Be isotope, which decays only through electron capture into lithium (Li) after a short fall (about 53 days). It turns out that the detection of beryllium can be a significant point for understanding new ones.

This information suggests that the classic new ones have created a huge amount of lithium in the Milky Way. But for a full understanding of this issue will have to spend a lot more research. In the future, scientists are planning to focus on a more accurate characterization of the beryllium and lithium masses, which are formed during the burst of a new one.

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